更久远的2003 感觉上跟我们比较没多大关系 @@ 课程名称︰分析化学三 课程性质︰五选三必修 课程教师︰何国荣 开课学院：理学院 开课系所︰化学系 考试时间︰2003.11.18 是否需发放奖励金：是 （如未明确表示，则不予发放） 试题 : Briefly answer the following questions. (108 points) 6 points each 1. Describe the difference between accuracy and trueness. 2. Describe the effect of precision and sensitivity to detection limit. 3. How are Fourier transformation used to reduce noise? 4. Describe the effect of precision on concentration to the quality of a calibration curve. 5. Describe the advantage of advantage of active filtering over passive filtering. 6. Which of the following is more suitable to signals that are changing rapidly? a)Boxcar averaging b)Ensemble averaging. Why? 7. Describe and explain the major compounds of a quality assurance program. 8. What is the major purpose of a)spike recoveries b)field blank? 9. Draw a control chart for the mean of dulplicate measurements. x bar(上横线)=95%, S=3% 10.Describe the advantage of strtified sampling over random sampling. 11.Random distribution is the major assumption for a)systematic sampling or b)random sampling. Why? 12.Describe the major factors affecting the amount of sample in sampling. 13.The usefulness of ANOVA in sampling. 14.Describe the advantage of a)GC/MS over GC/FID b)MS/MS over GC/MS. 15.ECNCI can have better sensitivity and selectivity than EI or CI. Why? 16.Describe the usefulness of mass spectrometry in quantitative proteomics. 17.Describe the role of matrix in a)FAB b)MALDI. 18.In EI, what is the advantage and disadvantage of using electron energy of 15 eV? Bonus (10 points) a)Derive and describe the equation for overall variance of nr measurements of a composite sample which was made from ns grab samples. 5% b)Describe the condition that the equation in (a) is a good alternative for ns grab samples and nr measurments of each sample. 5% --

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